Tire pressure gauge with cap wrench

ABSTRACT

A tire pressure gauge with a valve cap wrench is disclosed. A bore at one end of the tire pressure gauge may be used to grip and remove a valve cap mounted on a valve stem of a tire. A port at the other end of the tire pressure gauge may be used to measure air pressure in a tire. The measured air pressure may be displayed on a display on the pencil gauge. The cap wrench may have a collet to hold a valve cap and a switch to tighten and loosen grip on a valve cap. The cap wrench may also have a plunger to push a valve cap out of the pencil gauge.

RELATED CASES

This application claims benefit of and priority to U.S. ProvisionalPatent Application Ser. No. 61/000,702, filed Oct. 26, 2007, whichapplication is hereby incorporated by reference herein in its entirety.

FIELD OF THE INVENTION

The present invention relates generally to a pressure gauge and moreparticularly to a tire pressure gauge with a cap removal wrench.

BACKGROUND OF THE INVENTION

Pressure gauges are conventionally used for measuring the pressure of agas or a liquid, such as an air pressure. Tire pressure gauges, as anexample, measure the inflation pressures of vehicle tires, suchinformation being useful for maintaining optimal tire performance andavoiding unnecessary wear. Conventional tire pressure gauges are held inthe hand, and require the user to locate a tire valve, unscrew a capfrom the valve, and engage the tire pressure gauge with the valve. Tirevalve caps are usually covered in a film of dirt, which comes off on theuser's fingers when removing and replacing the cap. Sometimes, tirevalve caps may be difficult to remove because dirt may be lodged betweenthe valve stem and the cap. Under such circumstances, some amount offorce may be required to remove the cap. There are also occasions whenan individual may not want to sully one's hands with the grime on thevalve caps.

SUMMARY OF THE INVENTION

A tire pressure gauge with cap wrench has a housing. A bore is definedin the housing and is adapted to accommodate a tire valve stem cap. Thepressure gauge further includes a collet positioned in the bore and isadapted to selectively engage and disengage the tire valve stem cap. Auser-operable switch is mechanically coupled with the collar and isadapted to cause said collet to selectively engage and disengage thetire valve stem cap. A port is defined in the housing and is adapted toengage and open a needle valve on a tire valve stem. The tire pressuregauge further includes a pressure sensor positioned in the housing. Thepressure sensor is adapted to be in fluidic communication with a fluidin a tire when the port engages and opens the needle valve on the tirevalve stem and to measure the pressure of the fluid in the tire. Thetire pressure gauge also includes a display on the housing to display anumerical value indicative of the measured pressure.

According to an embodiment of the invention, a combined tire pressuregauge and valve cap wrench includes a housing having a bore and a port.The port is adapted to engage and open a needle valve on a tire valvestem. A collet is positioned in the bore and includes a generallycylindrical section defining a plurality of longitudinal slits. A rampis defined on the generally cylindrical section and a plurality of armsextends from the generally cylindrical section. An inward depression ofthe ramp causes a concentric contraction of the plurality of arms and anoutward release of the ramp causes a concentric expansion of theplurality of arms. The combined tire pressure gauge and valve cap wrenchalso includes a sleeve positioned along an interior surface defined bythe plurality of arms. The sleeve is adapted to contract and expandconcentrically, responsive to concentric contraction and expansion ofthe plurality of arms respectively, thereby establishing and releasing agenerally firm grip over a tire valve stem cap accommodated in the borerespectively. A collar having an inwardly protruding circumferential lipis positioned generally concentrically with the collet. The lip isadapted to engage the ramp to either inwardly depress the ramp tooutwardly release the ramp. A user-operable switch is coupled to thecollar and disposed on the housing. The switch is adapted to cause thecollar to slide about the collet and cause the lip to inwardly depressor outwardly release the ramp, thereby selectively causing the pluralityof arms and the sleeve to either concentrically contract and establish agenerally firm grip over a tire stem valve cap accommodated in the boreor to concentrically expand and release a generally firm grip over atire valve stem cap accommodated in the bore. The combined tire pressuregauge and valve cap wrench further includes a pressure sensor positionedin the housing. The pressure sensor is adapted to be in fluidiccommunication with a fluid in a tire when the port engages and opens theneedle valve on the tire valve stem and to measure the pressure of thefluid in the tire. A display on the housing displays a numerical valueindicative of the measured pressure.

BRIEF DESCRIPTION OF THE FIGURES

Understanding of the present invention will be facilitated byconsideration of the following detailed description of the preferredembodiments of the present invention taken in conjunction with theaccompanying drawings, in which like numerals refer to like parts and inwhich:

FIGS. 1A-1B illustrate two perspective views of a tire pressure gaugewith cap wrench as per an embodiment of the invention;

FIGS. 1C-1D show a top view and a side view of a tire pressure gaugewith cap wrench, as per an embodiment of the invention;

FIG. 1E is a side view of a tire pressure gauge with cap wrench, as peranother embodiment of the invention;

FIG. 2 show an exploded view of a tire pressure gauge with cap wrench asper an embodiment of the invention;

FIG. 3 illustrates a perspective view of an embodiment of a collet usedin a tire pressure gauge with cap wrench;

FIG. 4 shows an exemplary embodiment of a sleeve used in conjunctionwith a collet of FIG. 4 in a tire pressure gauge with cap wrench;

FIG. 5A illustrates an assembly view of cap wrench in an embodiment of atire pressure gauge with cap wrench;

FIG. 5B illustrates a cross-sectional view of cap wrench of FIG. 5A; and

FIG. 6 is a block diagram showing a pressure sensor, analog to digitalconverter, a processor, a display, and a battery.

DETAILED DESCRIPTION OF THE INVENTION

It is to be understood that the figures and descriptions of the presentinvention have been simplified to illustrate elements that are relevantfor a clear understanding of the present invention, while eliminating,for purposes of clarity, many other elements found in pressure gauges.However, because such elements are well known in the art, and becausethey do not facilitate a better understanding of the present invention,a discussion of such elements is not provided herein. The disclosureherein is directed to all such variations and modifications known tothose skilled in the art.

Further, it should be understood that the several views of the housings,displays and general configurations shown in the figures include manydecorative or ornamental features, aspects of which the particulars maybe changed while maintaining the device's utility and without departingfrom the scope and spirit of the present invention.

Now referring to FIG. 1A, a perspective view of an exemplary embodimentof a tire pressure gauge with cap wrench 100 is illustrated. Gauge 100has an elongated housing 150 with two ends 105, 110. End 105 has a port115 adapted to engage with and open the needle valve on a suitable tirevalve stem. A tire valve stem is typically in the form of a tube,threaded on the exterior near the end thereof, to permit attachment of aprotective cap, and having a valve, referred to variously as a pinvalve, bleeder valve, or Schrader valve. This type of valve is keptnormally closed by a combination of air pressure and a spring urging astopper into contact with an opening. A pin extending out of the valvemay be urged inward, such as by a piston in a nozzle of a servicestation air hose, to open the valve to permit the introduction ofpressurized air into the tire. Port 115 may include such a pin.

Proximal to end 105 is an uneven surface/area 120, which facilitate afirm gripping of gauge 100 when measuring air pressure of a tire. In theillustrated embodiment, area 120, adjacent to port 115, has ribs. Adisplay 125, on housing 150, displays the measured air pressure in atire. Display 125 may be, for example, a liquid crystal display.Proximal to end 110 are grip areas 130, adjacent to bore 135 (of FIG.1B). Grip areas 130 facilitate a firm grip over gauge 100 when it isused to remove or mount a valve cap on a valve stem. Grip areas 130 alsovisually indicate rotation for removal and mounting of tire valve stemcaps or valve caps. Grip areas 130 may be protruding or recessedfeatures of any shape, or pattern and may include both protruding andrecessed features. Grip areas 130 may include longitudinal ribs, asillustrated.

Now referring to FIG. 1B, gauge 100 has a bore 135 at end 110. Bore 135is configured to accommodate tire valve stem caps of different sizes. Inan exemplary embodiment, bore 135 may accommodate valve caps withdiameters in the range of 9.2 millimeter (mm) to 12.4 mm. Gauge 100 hasa release switch 140, which can grip as well as release a valve capinside port 135.

FIGS. 1C and 1D illustrate a top view and a side view of a pencil gauge100, as per an embodiment of the invention.

Now referring to FIG. 1 E, an alternate embodiment of tire pressuregauge 100 is illustrated. At end 105, gauge 100 has an angled ball part145, which can be positioned over a valve stem to measure air pressurein a vehicle tire.

FIG. 2 illustrates an exploded view of a gauge 100 as per an embodimentof the invention. In an exemplary embodiment, housing 105 of gauge 100has two housing halves 205, 210. Housing halves 205, 210 collectivelyhouse various components of gauge 100, as detailed below. Housing halves205, 210 may be made of, for example, ABS. Housing halves 205, 210define a substantially cylindrical housing 150 with open ports 115, 135at each end 105,110 respectively. Housing 150 proximal to end 110 has aconsiderably larger cross-section than the cross-section proximal to end105. In another embodiment, housing 150 may have a uniform size from end105 to end 110.

Gauge 100 has a pressure sensor (not shown) in a sensor housing 215.Angled ball part 145 is in fluidic communication with a chamber insensor housing 215 within which a sensor is disposed. Pressure sensor(not shown) in housing 215 may be any one of a number of conventionalsensors for detecting fluid pressure, and particularly air pressure, andselected to provide acceptable response over a range of pressuresanticipated in a particular application. By way of example, pressuresensor (not shown) may incorporate a MEMS based pressure die. The outputof pressure sensor (not shown) is displayed by display 125. Display 125may be powered by a power source 225, which, for example, may be abattery.

Components such as pressure sensor (not shown), display 125, and powersource 225 may be mounted on a board 257, which in turn is mounted onhousing half 205 using known fastening means such as screws. Board 257may be, for example, made of sintered ceramics.

Still referring to FIG. 2, housing halves 205, 210 further encompasses acollar 230, a plunger 235, a collet 240 having arms 255, and a sleeve245. A ring 250 caps end 110 of housing 105. In an exemplary embodiment,collar 230, plunger 235 and collet 240 may be injection molded plasticparts, while ring 250 may be a metal ring. Plunger 235 and collar 230are so connected as to act as a single unit. A release switch 140 isdisposed on housing 150. Release switch 140 is attached or mechanicallycoupled to collar 230. In an embodiment, release switch 140 and collar230 may be integral. When release switch 140 is pushed in one direction,collar 230 also translates in the same the direction by the samedistance. Since plunger 235 is generally rigidly connected to collar230, movement of release switch 140 will result in similar movement ofplunger 235. A sleeve 245 is fitted along arms 255 of collet 240. In anexemplary embodiment, sleeve 245 may be made of an elastomeric material.

Now referring to FIG. 3, collet 240 is illustrated. Collet 240 has agenerally cylindrical section 301. Longitudinal slits 303 are defined ingenerally cylindrical section 301. Collet 240 has a ramp 305. In anexemplary embodiment, ramp 305 has a taper which narrows towards arms255. In an alternative embodiment, ramp 305 may have a taper whichwidens towards arms 255. The illustrated embodiment of collet 240 hasfour arms 255. Alternative embodiments of collet 240 may have a greateror a lesser number of arms. In an exemplary embodiment of the invention,arms 255 have T-shaped grooves 310. Alternate shapes of grooves are alsocontemplated to be within the scope of the invention.

FIG. 4 illustrates an exemplary embodiment of sleeve 245. Sleeve 245 isassembled into arms 255, along an interior surface defined by arms 255,of collet 240. Sleeve 245 may provide grip over a valve cap (not shown)and may reduce wear and tear of arms 255. In an exemplary embodiment ofthe invention, sleeve 245 has T-shaped longitudinal tabs 405 which areconfigured to engage with grooves 310 (of FIG. 3). Alternate shaped tabsare also contemplated to be within the scope of the invention such thatthe tabs may engage with correspondingly shaped grooves on arms 255 (ofFIG. 3). Sleeve 245 has a plurality of relatively inflexible sections orpads 410 on the interior surface of sleeve 245. Sections or pads 410 areadapted to engage with the valve caps (not shown) and thus reduce wearand tear of sleeve 245. Pads 410 are inflexible relative to the materialof sleeve 245. Sleeve 245 has a plurality of bending sections 415 whichmay act as springs and facilitate sleeve 245 in regaining its originalshape from a contracted state. Bending sections 415 are interspersedbetween a plurality of curved sections 420.

Referring now to FIGS. 5A-5B, an exemplary assembly for collar 230,plunger 235, collet 240 and sleeve 245 is shown. Collar 230 has agenerally cylindrical interior surface having a constant diameter, withan inwardly protruding circumferential lip 505. When release switch 140is pushed in the direction away from arms 255 of collet 240, collar 230via lip 505, contacts and urges ramp 305 (of FIG. 3) inward; as aresult, arms 255 contract concentrically and urge sections 410 of sleeve245 inward into contact with the valve cap and establish a generallyfirm grip over the valve cap (not shown). FIG. 5A illustrates the statewhere ramp 305 is depressed inwardly via lip 505 of collar 230. Sleeve245 expands, on the other hand, when release switch 140 is pushed in thedirection towards arms 255, collar 230 releases the pressure on ramp305, causing ramp 305 to be released outwardly, as lip 505 of collar 230slides away from ramp 305. As a result, arms 255 expand concentrically,and pull sleeve 245 outward and loosen the grip on or disengagecompletely from the valve cap (not shown). At the same time, plunger235, which is connected or otherwise mechanically coupled to collar 230,pushes out a valve cap (not shown) and the valve cap is released fromgauge 100.

Referring now to FIG. 6, a block diagram illustrates the schematicallythe arrangement of components in tire pressure gauge 100. A pressuresensor 605, when subjected to pressurized air from, for example, a tire,senses the air pressure. Pressure sensor 605 may be within a chamber influid communication with the interior of a tire when gauge 100 ismeasuring pressure. Pressure sensor 605 generates an analog outputindicative of the sensed air pressure which is provided to ananalog-to-digital converter 610. Converter 610 converts the analogsignal received from sensor 605 and generates a digital signalindicative of the measured pressure, which digital signal is provided toa processor 620. Processor 620 is powered by a battery 615 and causes adisplay 625 to display, for example, a numerical value indicative of themeasured air pressure.

An exemplary method of using gauge 100 will now be described. Gauge 100may first be placed on a valve cap (not shown) mounted on a valve stemof a tire such that sleeve 245 surrounds the valve cap. Release switch140 is pushed away from end 110 which results in arms 255 urgingsections 410 of sleeve 245 into frictional engagement with the valvecap. Gauge 100 is rotated by gripping around recess grip areas 130 tounscrew the valve cap, so as to remove the valve cap from a valve stem.Air pressure in the tire is then measured by engaging gauge 100, throughport 115, with and opening the needle valve on a conventional tire valvestem. Pressure sensor 605 measures the air pressure and generates ananalog signal indicative of the air pressure, which analog signal is fedto analog-to-digital converter 610. Converter 610 converts the analogsignal into a digital signal indicative of the air pressure, whichdigital signal is fed to processor 620. Processor 620 causes themeasured air pressure to be displayed on display 125. Once the airpressure is measured, the valve cap held in sleeve 245 is placed back onthe valve stem. Gauge 100 is turned to mount the valve cap on the valvestem. When the valve cap is mounted, release switch 140 is pushed in thedirection towards the valve cap, which will cause the grip on the valvecap to be loosened and plunger 235 to push out the valve cap. Thus, onecan prevent getting one's hands dirty as well as relatively easilyremove valve cap using the pencil gauge with cap wrench 100. Anotheradvantage is the valve cap will not be misplaced or lost when airpressure of a tire is measured.

In the illustrated embodiment, gauge 100 is in the form of pencil gauge,with a port for receiving pressurized air at one end of an elongatedhousing, and a grip for a cap wrench at the opposite end. However, thehousing may also be in other forms.

It will be apparent to those skilled in the art that modifications andvariations may be made in the apparatus and process of the presentinvention without departing from the spirit or scope of the invention.It is intended that the present invention cover the modification andvariations of this invention provided they come within the scope of theappended claims and their equivalents.

1. A tire pressure gauge with a valve cap wrench comprising: a housing;a bore defined in said housing, said bore adapted to accommodate a tirevalve stem cap; a collet positioned in said bore, said collet adapted toselectively engage and disengage a tire valve stem cap accommodated insaid bore; a user-operable switch mechanically coupled to said colletand disposed on said housing, said switch adapted to cause said colletto selectively engage and disengage a tire valve stem cap; a portdefined in said housing, said port adapted to engage and open a needlevalve on a tire valve stem; a pressure sensor positioned in saidhousing, said pressure sensor adapted to be in fluidic communicationwith a fluid in a tire when said port engages and opens a needle valveon a tire valve stem and to measure the pressure of the fluid in thetire; and a display on said housing, said display displaying a numericalvalue indicative of the measured pressure.
 2. The tire pressure gauge ofclaim 1, wherein said collet further comprises: a plurality of arms; anda ramp, wherein an inward depression of said ramp causes said pluralityof arms to contract concentrically, and wherein an outward release ofsaid ramp causes said plurality of arms to expand concentrically.
 3. Thetire pressure gauge of claim 2, wherein said ramp comprises a taperwhich narrows towards said plurality of arms.
 4. The tire pressure gaugeof claim 3, further comprising a collar mechanically coupled with saidswitch, said collar comprising: a generally cylindrical interior surfacehaving a constant diameter; and an inwardly protruding circumferentiallip, said lip adapted to engage said ramp and to inwardly depress saidramp or to disengage said ramp and outwardly release said ramp.
 5. Thetire pressure gauge of claim 4, further comprising a plunger coupled tosaid collar, wherein, when said switch is pushed by a user in a firstdirection along said housing away from said bore, said switch causessaid lip of said collar to engage and inwardly depress said ramp,thereby causing said plurality of arms to contract concentrically andestablish a generally firm grip over a tire valve stem cap accommodatedin said bore, and wherein, when said switch is pushed by a user in asecond direction along said housing towards said bore, said switchcauses said lip of said collar to disengage and outwardly release saidramp, thereby causing said plurality of arms to expand concentricallyand release the generally firm grip over the tire valve stem capaccommodated in said bore and said switch simultaneously causes saidplunger to move in the second direction towards said bore and to pushthe tire valve stem cap out from said bore.
 6. The tire pressure gaugeof claim 2, wherein said ramp comprises a taper which widens towardssaid plurality of arms.
 7. The tire pressure gauge of claim 2, furthercomprising a sleeve positioned along an interior surface defined by saidplurality of arms, wherein said sleeve contracts concentrically toestablish a generally firm grip on a tire valve stem cap accommodated insaid bore when said plurality of arms contract concentrically andwherein said sleeve expands concentrically to release the generally firmgrip on the tire valve stem cap accommodated in said bore when saidplurality of arms expand concentrically.
 8. The tire pressure gauge ofclaim 7, wherein said sleeve is made of an elastomeric material.
 9. Thetire pressure gauge of claim 7, wherein said sleeve further comprises aplurality of relatively inflexible pads on an interior surface of saidsleeve, said plurality of relatively inflexible pads adapted to directlyengage a tire valve stem cap accommodated in said bore and to establishthe generally firm grip on the tire valve stem cap when said sleevecontracts concentrically.
 10. The tire pressure gauge of claim 7,wherein said sleeve comprises a plurality of bending sectionsinterspersed between a plurality of curved sections, wherein saidplurality of bending sections is adapted to assist said sleeve regainits original shape when said plurality of arms expand concentrically.11. The tire pressure gauge of claim 7, wherein each of said pluralityof arms comprises a groove, and wherein said sleeve comprises aplurality of longitudinal tabs, each of said plurality of longitudinaltabs being adapted to engage said groove.
 12. The tire pressure gauge ofclaim 1, further comprising: an analog-to-digital converter, saidconverter receiving an analog signal from said pressure sensor andgenerating a digital signal indicative of the measured pressure; aprocessor, said processor receiving said digital signal and causing saiddisplay to display a numerical value indicative of the measuredpressure; and a power source, said power source providing power to saidprocessor and to said display.
 13. The tire pressure gauge of claim 1,wherein said housing is an elongated housing.
 14. The tire pressuregauge of claim 13, further comprising a plurality of ribs on an outersurface of said housing adjacent to said port.
 15. The tire pressuregauge of claim 13, further comprising a plurality of longitudinal ribson an outer surface of said housing adjacent to said bore.
 16. The tirepressure gauge of claim 13, further comprising a plurality oflongitudinal grooves in an outer surface of said housing adjacent tosaid bore.
 17. The tire pressure gauge of claim 13, wherein said housinghas a cross-section proximal to said bore larger than a cross-sectionproximal to said port.
 18. A combined tire pressure gauge and a valvecap wrench comprising: a housing having a bore and a port, wherein saidport is adapted to engage and open a needle valve on a tire valve stem;a collet positioned in said bore, wherein said collet comprises: agenerally cylindrical section defining a plurality of longitudinalslits; a ramp defined on said generally cylindrical section; and aplurality of arms extending from said generally cylindrical section,wherein an inward depression of said ramp causes a concentriccontraction of said plurality of arms, and an outward release of saidramp causes a concentric expansion of said plurality of arms, a sleevepositioned along an interior surface defined by said plurality of arms,said sleeve adapted to contract and expand concentrically, responsive toconcentric contraction and expansion of said plurality of armsrespectively, thereby establishing and releasing a generally firm gripover a tire valve stem cap accommodated in said bore respectively; acollar having an inwardly protruding circumferential lip, said collarpositioned generally concentrically with said collet, and said lipadapted to engage said ramp to either inwardly depress said ramp or tooutwardly release said ramp; a user-operable switch coupled to saidcollar and disposed on the housing, said switch adapted to cause saidcollar to slide about said collet and cause said lip to inwardly depressor outwardly release said ramp, thereby selectively causing saidplurality of arms and said sleeve to either concentrically contract andestablish a generally firm grip over a tire valve stem cap accommodatedin said bore or to concentrically expand and release a generally firmgrip over a tire valve stem cap accommodated in said bore; a pressuresensor positioned in said housing, said pressure sensor adapted to be influidic communication with a fluid in a tire when said port engages andopens the needle valve on the tire valve stem and to measure thepressure of the fluid in the tire; and a display on said housing, saiddisplay displaying a numerical value indicative of the measuredpressure.
 19. The combined tire pressure gauge and cap wrench of claim18, wherein said housing is an elongated housing, wherein said port isdefined at a first end of said housing and wherein said bore is definedat a second end of said housing.
 20. The combined tire pressure gaugeand cap wrench of claim 19, further comprising an angled ball partdisposed at said first end, wherein said port is defined by said angledball part.